Brush-holder for dynamos



(No Model.)

W. LE R. EMMET. BRUSH HOLDER FOR DYNAMOS.

Patented Apr. 28, 1891.

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n m I m "II 2 m'kimsssvsz wwvszwkiwa l l l l l l I UNITED STATES PATENTOFFICE.

. \VILLIAM LE ROY EMMET, OF EAS l ROCKZ-UVAY, NE\V YORK.

BRUSH-HOLDER FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 451,177, dated April28, 1891.

Application filed September 18, 1890. Serial No. 365,402. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM LE RoY En- MET, a citizen of the UnitedStates, residing at East Rockaway, Queens county, and State of New York,have invented a certain new and useful Improved Brush-Holder forDynamos, of which the following is a specification.

In the accompanying drawings, which make part of this specification,Figure l is a rear elevation; Fig. 2, a section on a line drawn at theextreme right of the spring 12 in Fig. 1,

and Fig. 3 a plan view on line 00 a: of Fig. 2.

My invention relates to devices for pressing the carbon brush againstthe commutator of a dynamo and making proper electrical connection tothe commutator with said carbon. One of the advantages of thisparticular construction is that it provides for a convenientlyadjustablepressure upon the rear end of the brush. The pressure isalso transmittedto the carbon through flexible teeth, which readily vibrate withoutmoving the frame and make contact along the Whole face of the brush byreason of their flexibility. This construction reduces the pressurenecessary to be employed. The brush may also be removed from the face ofthe commutator without disturbing the brush-holder. Likewise the brushmay be entirely removed from the holder without changing the position ofthe latter. By the particulararrangement of the tension devices insidethe brackets of the frame of the brush-holder the largest possibleamount of contact-surface is secured between brush and commutator with agiven size of frame. Finally the heel of the brush is protected fromabrasion, while a good electrical connection is obtained between thepressure device and the brush.

In building my brush-holder I use a frame of the general shape seen inthe several views. At the-rear end and base of said frame is thestud-hole l for the horizontal stud, parallel to the line of thecommutator-shaft. Said stud is secured by set-screw 2, which entersusual keyway in stud. Communicating with said stud-hole 1 is aspring-slot 3, sprung by bolts 4 4.. At the front of said frame is thechute 5 with roof 6, which acts as an open ended box for the carbonbrush 7, which is may obviously be greatly varied.

preferably electroplated. 8 S are two flush side brackets of the framewith spindle 9 fixed between their upper ends. Upon said spindle turns aloose ratchet-wheel 10, dogged by spring-pawl l1, screwed at its lowerend to roof 6 of chute 5. Around said spindle is coiled a spring12,0neloopof which is hooked upon the ratchet-wheel 10. The ends of saidspring 12 bear upon apressure-levcr 1S,pivoted upon the spindle. Saidpressure-lever isherc shown as a frame consisting of two side bars andtwo transverse bars; but this construction At the bottom of saidpressure-lever 13 is fastened a metallic spring-comb 14.. A catch 15holds the pressure-lever 13 when the brush 7 is withdrawn. Said catch isalso secured to the roof 6 of the chute. Upon the rear of said carbonbrush are soldered duplicate metal heel-plates 1G 16. Each of thesetakes a backward turn, and then is laid back against the teeth of thecomb.

In operation the brush-holder is secured upon its stud and clampedopposite to any desired portion of the commutators surface. The brush isput in the box and the metal heel-plates hooked around the teeth of thecomb and the tension-wheel turned until the proper pressure is obtained.The teeth of the comb will then bear against the carbon brush, making anintimate contaot therewith at a comparatively-light pressure, thusreducing wear and tear by friction on meeting surfaces. The teeth alsoadjust themselves to the irregularities on the rear face of the carbon.Should it be desired to withdraw the brush from the commutator, this canbe done without moving the frame or altering the tension, as the catchwill hold the pressurelever in position. This feature is advantageous,as it enables the brush to be returned to its exact former position,where it will neatly fit in the place it has worn. As the brush can beslid along its stud to any point, the face of the commutator may be wornevenly along its entire length. Since the tension-wheel is put betweenthe side brackets their faces may be flush and the entire width of thebrush-holder less the thickness of the side brackets is effective forcontact on the commutator. By turning the ratchet-wheel back the entiretension can be taken off the spring and the brush removed from theholder. The catch may be applied to other pressurelevers than the onehere shown. The brush employed may be an y of the common types ofbrushes used upon dynamos.

I claim 1. In an organized brush-holder, the combination of a frame, apressure-lever pivoted to said frame, means for imparting pressure tosaid lever, a brush-socket, a catch to lock said lever back, and a brushnormally loosely attached to said lever and unconnected with saidbrush-socket, substantially as set forth.

2. In an organized brush-holder, the combination of a frame, a spindlesupported between the side brackets of said frame, a loose ratchet-Wheelmounted upon said spindle, a pawl engaging said ratchet-wheeh'a springderiving its tension from its connection with said wheel, apressure-lever pivoted upon said spindle and acted upon by said spring,a brush-socket, and a brush unconnected with said socket and normallyloosely connected with said lever, substantially as set forth.

3. In an organized brush-holder, the combination of a frame with flushside brackets, a spindle supported between said side brackets, a looseratchet-wheel upon said spindle, a pawl engaging said wheel, a springsecured to said ratchet-wheel and bearing upon a pressure-lever pivotedto said spindle, said pressure-lever, a brush-socket, and a brushunconnected with said socket and normally loosely connected with saidlever, substantially as set forth.

at. In an organized brush-holder, the combination of a frame, apressure-lever pivoted to said frame, means for imparting pressure tosaid lever, a spring-comb secured to said lever, a carbon brush, meansfor loosely attaching said carbon brush to said springcomb, and a catchfor holding back said brush and said comb from the commutator,substantially as set forth.

5. In an organized brush-holder, the combination of a pressure devicefor thrusting the carbon brush normally against the commutator, saidcarbon brush, guides for said carbon brush, devices for looselyattaching said pressure devices to said brush, and a catch to hold backsaid pressure devices and brush from the commutator, substantially asset forth.

In testimony whereof I have hereunto set my hand.

WILLIAM LE ROY EMME'I.

Witnesses:

JAMEs A. MoKEAN, Wu. L. PIERCE.

